<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{ this.$store.state.city }}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hotCities"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{ item.name }}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{ key }}</div>
        <div class="item-list">
          <div
            class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
          >
            {{ innerItem.name }}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from "better-scroll";
import axios from "axios";

export default {
  name: "CityList",
  props: {
    letter: String,
  },
  data() {
    return {
      hotCities: [],
      cities: {},
    };
  },
  methods: {
    loadData() {
      axios
        .get("http://localhost:3000/hotCities")
        .then((res) => {
          this.hotCities = res.data;
        })
        .catch((err) => {
          console.log(err);
        });
    },
    loadCities() {
      axios
        .get(" http://localhost:3000/cities")
        .then((res) => {
          this.cities = res.data;
        })
        .catch((err) => {
          console.log(err);
        });
    },
    handleCityClick(city) {
      // this.$store.dispatch("changeCity", city);
      // 可以不用dispatch，直接使用commit，调用mutation
      this.$store.commit("changeCity", city);
      // 编程式导航，当点击了城市之后，直接回到首页
      this.$router.push("/");
    },
  },
  mounted() {
    this.loadData();
    this.loadCities();
    this.scroll = new Bscroll(this.$refs.wrapper);
  },
  watch: {
    letter() {
      if (this.letter) {
        const element = this.$refs[this.letter][0];
        this.scroll.scrollToElement(element);
      }
    },
  },
};
</script>

<style lang='stylus' scoped>
.border-topbottom::before, .border-topbottom::after {
  border-color: #ccc;
}

.border-bottom::before {
  border-color: #ccc;
}

.list {
  overflow: hidden;
  position: absolute;
  top: 1.68rem;
  left: 0;
  right: 0;
  bottom: 0;
}

.title {
  text-align: left;
  line-height: 0.54rem;
  background-color: #eee;
  padding-left: 0.2rem;
  color: #666;
  font-size: 0.26rem;
}

.button-list {
  padding: 0.1rem 0.6rem 0.1rem 0.1rem;
  overflow: hidden;
}

.button-wrapper {
  float: left;
  width: 33.33%;
}

.button {
  padding: 0.1rem 0;
  border-radius: 0.06rem;
  margin: 0.1rem;
  text-align: center;
  border: 0.02rem solid #ccc;
}

.item-list .item {
  line-height: 0.76rem;
  padding-left: 0.2rem;
  text-align: left;
}
</style>